2013
DOI: 10.1002/app.39894
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A new method of preparing superabsorbent PVF porous foam through the simultaneous acidification of water glass solution–aspect of environmental protection

Abstract: To reduce the wastewater pollution problem, silica particles that have resulted from simultaneous sulfuric acidification of water glass solution serve as the pore-forming agent for preparing superabsorbent PVF/SiO 2 foam in this study. This is a departure from the traditional porous PVF/starch foam's manufacture method. The pore structure of PVF/SiO 2 foam is very different from that of PVF/starch foam. The effect of the concentration of these pore-forming agents on the pore structure, mechanical modulus, and … Show more

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Cited by 14 publications
(12 citation statements)
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“…Also, this SD phenomenon can be accelerated by the decreased viscosity of the PVA reaction solution when the reaction temperature is increased from 50°C to 60°C. Since the viscosity of the PVA reaction solution adopted in the present experiments increases with the increase of either PVA concentration or the decrease of solution temperature, as illustrated by the schematic diagram in Figure , because of its decreased viscosity, the drainage velocity of the PVF polymer formatted at 60°C between two water bubbles is faster than that of 50°C under the same PVA concentration. This increased drainage velocity reduces the wall thickness of PVF formatted between two water bubbles, and therefore can easily induce a larger pore size in PVF foams at 60°C than that at 50°C.…”
Section: Resultssupporting
confidence: 60%
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“…Also, this SD phenomenon can be accelerated by the decreased viscosity of the PVA reaction solution when the reaction temperature is increased from 50°C to 60°C. Since the viscosity of the PVA reaction solution adopted in the present experiments increases with the increase of either PVA concentration or the decrease of solution temperature, as illustrated by the schematic diagram in Figure , because of its decreased viscosity, the drainage velocity of the PVF polymer formatted at 60°C between two water bubbles is faster than that of 50°C under the same PVA concentration. This increased drainage velocity reduces the wall thickness of PVF formatted between two water bubbles, and therefore can easily induce a larger pore size in PVF foams at 60°C than that at 50°C.…”
Section: Resultssupporting
confidence: 60%
“…The water adsorption capacity and the water desorption rate of PVF foams were determined using DuPont TGA‐Q50 thermal analyzer . Under nitrogen flow rate of 100 cm 3 /min, the water adsorption capacity of PVF foams were calculated from the weight loss at 100°C when each 20 mg sample was heated from room temperature to 600°C with a heating rate of 10°C/min, and the water desorption rate was determined when each sample was heated at 50°C for 50 minutes, respectively …”
Section: Methodsmentioning
confidence: 84%
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